Bug 9077 [3.8.x] OPAC Social media links broken by fix for Bug 8973

Bug 9077 [3.8.x] OPAC Social media links broken by fix for Bug 8973

This patch returns the structure of the social media icons
markup to the state it was in before the application of the
patch for Bug 8973 and adds the missing filters which would
have been added by that patch.

To test, view any OPAC detail page in origin/3.8.x. After
applying this patch the social media icons should appear
normally.

Signed-off-by: Srikanth Dhondi <srikanth@catalyst.net.nz>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>